Saving configuration in modern Drupal
This is $form_state->getValues() flat (#tree set to FALSE):
link_all: 0
article_field_categories: 0
article_field_tags: 0
bond_disclosure_report_field_bond_disclosure_type: 0
committee_meeting_field_committee: 0
committee_meeting_document_field_committee: 0
committee_meeting_document_field_meeting_doc_type: 0
event_field_categories: 0
page_field_page_type: 1
press_release_field_categories: 0
submit: 'Save configuration'
form_build_id: form-8DvlpJLttFXCx64DCUdOn0vPycCiiKyIdNJbCGPCx44
form_token: hX8vPQFxTqqp4Xm6Jds7Yug4VA1Vob11FjmIcXo-yaE
form_id: createcontentwithcategory_settings
op: 'Save configuration'
link_all: 0
target_nodes_fields:
article:
article_field_categories: 0
article_field_tags: 0
bond_disclosure_report:
bond_disclosure_report_field_bond_disclosure_type: 0
committee_meeting:
committee_meeting_field_committee: 0
committee_meeting_document:
committee_meeting_document_field_committee: 0
committee_meeting_document_field_meeting_doc_type: 0
event:
event_field_categories: 0
page:
page_field_page_type: 1
press_release:
press_release_field_categories: 0
submit: 'Save configuration'
form_build_id: form-BkNPXcaxiQ4i0cURKxcshqy9-CMmD_Gd-yx8vTNWMKU
form_token: hX8vPQFxTqqp4Xm6Jds7Yug4VA1Vob11FjmIcXo-yaE
form_id: createcontentwithcategory_settings
op: 'Save configuration'